I recently submitted a tune for SLS13 consideration. I submitted "Blue Orchid" from The White Stripes.
I heard this song for the first time Friday afternoon and the first thing that struck me was how short it was. I've heard it a few more times over the weekend and I'm digging it. It's got a fantastic crunchy guitar with a cool all around sound. The two and a half minutes is perfect too because it means we'll be able to cram more awesome into SLS13.